/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.example.gakko;

import java.util.ArrayList;

import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TabHost;
import android.widget.TabHost.TabSpec;
import android.widget.TabWidget;

import com.actionbarsherlock.app.SherlockFragmentActivity;
import com.actionbarsherlock.view.Menu;
import com.actionbarsherlock.view.MenuItem;
import com.example.gakko.setting.SettingActivity;
import com.example.gakko.utils.Utils;

/**
 * Demonstrates combining a TabHost with a ViewPager to implement a tab UI that
 * switches between tabs and also allows the user to perform horizontal flicks
 * to move between the tabs.
 */
public class HomeFragment extends SherlockFragmentActivity {
	TabHost mTabHost;
	ViewPager mViewPager;
	TabsAdapter mTabsAdapter;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		setTheme(SampleList.THEME); // Used for theme switching in samples
		super.onCreate(savedInstanceState);

		setContentView(R.layout.fragment_tabs_pager);

		getSupportActionBar().setDisplayHomeAsUpEnabled(false);
		getSupportActionBar().setHomeButtonEnabled(true);
		getSupportActionBar().setIcon(
				getResources().getDrawable(R.drawable.ic_launcher));
		getSupportActionBar().setTitle("GAKKO");
		getSupportActionBar().setBackgroundDrawable(
				getResources().getDrawable(R.drawable.bgr_taskbar));

		mTabHost = (TabHost) findViewById(android.R.id.tabhost);
		mTabHost.setup();

		mViewPager = (ViewPager) findViewById(R.id.pager);

		mTabsAdapter = new TabsAdapter(this, mTabHost, mViewPager);

		mTabsAdapter.addTab(createTab(R.drawable.tab_lichdau, "Sample1"),
				FragmentStackSupport.CountingFragment.class, null);

		mTabsAdapter.addTab(createTab(R.drawable.tab_lichdau, "Sample2"),
				FragmentStackSupport.CountingFragment.class, null);

		mTabsAdapter.addTab(createTab(R.drawable.tab_lichdau, "Sample3"),
				FragmentStackSupport.CountingFragment.class, null);

		mTabsAdapter.addTab(createTab(R.drawable.tab_lichdau, "Sample4"),
				FragmentStackSupport.CountingFragment.class, null);
		if (savedInstanceState != null) {
			mTabHost.setCurrentTabByTag(savedInstanceState.getString("tab"));
		}
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		boolean isLight = SampleList.THEME == R.style.Theme_Sherlock_Light;
		menu.add(0, Utils.MENU_SETTING, Menu.NONE, "Setting")
				.setIcon(
						isLight ? R.drawable.icon_setting
								: R.drawable.icon_setting)
				.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
		return true;
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		if (item.getItemId() == Utils.MENU_SETTING) {
			Intent intent = new Intent(HomeFragment.this, SettingActivity.class);
			startActivity(intent);
		}

		return super.onOptionsItemSelected(item);

	}

	public TabSpec createTab(int draw, String tile) {

		TabHost.TabSpec spec = mTabHost.newTabSpec("tab");
		View tabIndicator = LayoutInflater.from(this).inflate(
				R.layout.tab_indicator, null);

		ImageView icon = (ImageView) tabIndicator.findViewById(R.id.icon);
		icon.setImageResource(draw);

		spec.setIndicator(tabIndicator);
		return spec;

	}

	@Override
	protected void onSaveInstanceState(Bundle outState) {
		super.onSaveInstanceState(outState);
		outState.putString("tab", mTabHost.getCurrentTabTag());
	}

	public static class TabsAdapter extends FragmentPagerAdapter implements
			TabHost.OnTabChangeListener, ViewPager.OnPageChangeListener {
		private final Context mContext;
		private final TabHost mTabHost;
		private final ViewPager mViewPager;
		private final ArrayList<TabInfo> mTabs = new ArrayList<TabInfo>();

		static final class TabInfo {
			private final Class<?> clss;
			private final Bundle args;

			TabInfo(String _tag, Class<?> _class, Bundle _args) {
				clss = _class;
				args = _args;
			}
		}

		static class DummyTabFactory implements TabHost.TabContentFactory {
			private final Context mContext;

			public DummyTabFactory(Context context) {
				mContext = context;
			}

			@Override
			public View createTabContent(String tag) {
				View v = new View(mContext);
				v.setMinimumWidth(0);
				v.setMinimumHeight(0);
				return v;
			}
		}

		public TabsAdapter(FragmentActivity activity, TabHost tabHost,
				ViewPager pager) {
			super(activity.getSupportFragmentManager());
			mContext = activity;
			mTabHost = tabHost;
			mViewPager = pager;
			mTabHost.setOnTabChangedListener(this);
			mViewPager.setAdapter(this);
			mViewPager.setOnPageChangeListener(this);
		}

		public void addTab(TabHost.TabSpec tabSpec, Class<?> clss, Bundle args) {
			tabSpec.setContent(new DummyTabFactory(mContext));
			String tag = tabSpec.getTag();

			TabInfo info = new TabInfo(tag, clss, args);
			mTabs.add(info);
			mTabHost.addTab(tabSpec);
			notifyDataSetChanged();
		}

		@Override
		public int getCount() {
			return mTabs.size();
		}

		@Override
		public Fragment getItem(int position) {
			TabInfo info = mTabs.get(position);
			return Fragment.instantiate(mContext, info.clss.getName(),
					info.args);
		}

		@Override
		public void onTabChanged(String tabId) {
			int position = mTabHost.getCurrentTab();
			mViewPager.setCurrentItem(position);
		}

		@Override
		public void onPageScrolled(int position, float positionOffset,
				int positionOffsetPixels) {
		}

		@Override
		public void onPageSelected(int position) {
			// Unfortunately when TabHost changes the current tab, it kindly
			// also takes care of putting focus on it when not in touch mode.
			// The jerk.
			// This hack tries to prevent this from pulling focus out of our
			// ViewPager.
			TabWidget widget = mTabHost.getTabWidget();
			int oldFocusability = widget.getDescendantFocusability();
			widget.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);
			mTabHost.setCurrentTab(position);
			widget.setDescendantFocusability(oldFocusability);
		}

		@Override
		public void onPageScrollStateChanged(int state) {
		}
	}
}
